Features: At the range or on the hunt, the Howard Leight by Honeywell Impact Sport Sound Amplification Electronic Earmuff keeps you protected from hazardous noise and connected to your environment. It carries a Noise Reduction Rating (NRR) of 22 in both on and off mode. When the electronic ear protection is switched on, it employs built-in directional microphones that amplify ambient sounds to a safe 82 dB.